Cooling jacket

Abstract

A cooling jacket for cooling an electric motor is provided. The cooling jacket has one or more continuous S-shaped pipes, covering the electric motor, for conducting working fluid, wherein each continuous S-shaped pipe at least has: a forwarding portion and a reversed portion, respectively extending along two circumferential directions which are parallel but opposite to each other; and a turning portion connected between the forwarding portion and the reversed portion.

What is claimed is: 
     
         1 . A cooling jacket for cooling an electric motor comprising:
 one or more continuous S-shaped pipes, covering the electric motor, for conducting working fluid, wherein each continuous S-shaped pipe at least comprises:
 a forwarding portion and a reversed portion, respectively extending along two respective circumferential directions which are parallel but opposite to each other; and 
 a turning portion connected between the forwarding portion and the reversed portion. 
   
     
     
         2 . The cooling jacket as claimed in  claim 1 , wherein the forwarding portions and/or the reversed portions of the continuous S-shaped pipe have unequal pipe diameters. 
     
     
         3 . The cooling jacket as claimed in  claim 2 , wherein the pipe diameter of the continuous S-shaped pipe reduces from a working fluid inlet to a working fluid outlet. 
     
     
         4 . The cooling jacket as claimed in  claim 1 , wherein the cooling jacket has N sets of the continuous S-shaped pipes, and each set of the continuous S-shaped pipe covers a part of the electric motor. 
     
     
         5 . The cooling jacket as claimed in  claim 1 , wherein the cooling jacket has N sets of the continuous S-shaped pipes, and each set of the continuous S-shaped pipe covers 1/N of the circumference of the electric motor. 
     
     
         6 . The cooling jacket as claimed in  claim 1 , wherein the cooling jacket has two sets of the continuous S-shaped pipes, and the starting ends of the two sets of the continuous S-shaped pipes share a working fluid inlet. 
     
     
         7 . The cooling jacket as claimed in  claim 1 , wherein the cooling jacket has two sets of the continuous S-shaped pipes, and the terminating ends of the two sets of the continuous S-shaped pipes share a working fluid outlet. 
     
     
         8 . The cooling jacket as claimed in  claim 1 , wherein the flowing directions of the working fluid in any two sets of the continuous S-shaped pipes are opposite to each other. 
     
     
         9 . The cooling jacket as claimed in  claim 1 , further comprising a first continuous S-shaped pipe having a first forwarding portion, a first reversed portion and a first turning portion; and a second continuous S-shaped pipe having a second forwarding portion, a second reversed portion and a second turning portion, wherein each of the first forwarding, reversed and turning portions is respectively juxtaposed to the second forwarding, reversed and turning portions. 
     
     
         10 . The cooling jacket as claimed in  claim 1 , wherein each set of the continuous S-shaped pipes covers a different circumference of the electric motor.